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Equity and Long-Term Incentive Compensation Plans - Cash Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 04, 2018 | Nov. 07, 2018 | Nov. 19, 2014 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2014 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Dividends Payable |  |  |  |  |  |  |  |  |
Payment of dividends |  |  |  |  |  |  | $ 237,319 | $ 192,902 |
Dividends payable |  |  |  | $ 5,404 | $ 7,590 |  | 5,404 | 7,590 |
Regular cash dividend |  |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  |  |  |
Cash dividends declared (in dollars per share) |  | $ 0.75 |  |  |  |  |  |  |
Cash dividends paid per share (in dollars per share) | $ 0.75 |  |  |  |  |  |  |  |
Regular cash dividend | Restricted stock unit, Performance-based and Service-based |  |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  |  |  |
Dividends payable |  |  |  | 5,400 |  |  | 5,400 |  | $ 6,700
Regular cash dividend | Additional paid-in capital |  |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  |  |  |
Payment of dividends |  |  |  | $ 114,500 | $ 92,600 |  | 234,400 | 186,700 |
Special cash dividend |  |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  |  |  |
Cash dividends declared (in dollars per share) |  |  | $ 16.50 |  |  |  |  |  |
Cash dividends paid per share (in dollars per share) |  |  |  |  |  | $ 16.50 |  |  |
Special cash dividend | Restricted stock unit, Performance-based and Service-based |  |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  |  |  |
Dividends payable |  |  |  |  |  | $ 43,000 |  |  |
Cash dividends paid |  |  |  |  |  |  | $ 2,900 | $ 6,200 |

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